CN214165117U

CN214165117U - Gear type electric power steering mechanism

Info

Publication number: CN214165117U
Application number: CN202022567444.7U
Authority: CN
Inventors: 丛浩
Original assignee: BAIC Motor Co Ltd
Current assignee: BAIC Motor Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-09-10
Anticipated expiration: 2030-11-09

Abstract

A gear-type electric power steering mechanism comprising: the steering mechanism comprises a steering motor, a shell, a steering gear set, a driving sliding structure, a rack, a driven sliding structure and a plurality of rolling shafts, wherein the steering gear set, the driving sliding structure, the rack, the driven sliding structure and the rolling shafts are arranged in the shell; wherein, turn to motor, steering gear group, initiative sliding structure, rack and be connected in proper order the transmission, driven sliding structure fixed connection is in the casing, and supports the rack through a plurality of rollers, and the one end of rack is used for connecting the tie rod. The gear type electric power steering mechanism is simple in structure, and energy loss caused by rack friction in the steering process can be effectively reduced by utilizing rolling contact.

Description

Gear type electric power steering mechanism

Technical Field

The utility model belongs to the automobile field, more specifically relates to a gear formula electric power steering mechanism.

Background

The vehicle steering mechanism mainly comprises a mechanical type, an electric boosting type and a hydraulic boosting type. The Electric Power Steering (EPS) mainly comprises a Steering column motor Power assisting (C-EPS), a gear Power assisting (P-EPS) and a rack Power assisting (DP-EPS).

The gear type electric power steering mechanism which is mainstream in the market is composed of a full rack and a gear, power is provided by a motor, a bevel gear is meshed with a gear train, the motor drives the gear to drive the rack to move, and the operating force of a driver is reduced. Its main advantages are simple structure and low cost. However, the study on the friction coefficient and the energy loss shows that the rack has large energy loss in the boosting process. Therefore, it is desirable to further optimize such a steering structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gear formula electric power steering mechanism of low energy consumption.

In order to achieve the above object, the present invention provides a gear type electric power steering mechanism, which comprises: the steering mechanism comprises a steering motor, a shell, a steering gear set, a driving sliding structure, a rack, a driven sliding structure and a plurality of rolling shafts, wherein the steering gear set, the driving sliding structure, the rack, the driven sliding structure and the rolling shafts are arranged in the shell;

the steering motor, the steering gear set, the driving sliding structure and the rack are sequentially in transmission connection, the driven sliding structure is fixedly connected to the shell and supported by the plurality of rolling shafts, and one end of the rack is used for being connected with a tie rod.

Preferably, the steering gear set comprises a first bevel gear and a second bevel gear which are meshed with each other, the first bevel gear is connected with an output shaft of the steering motor, and the second bevel gear is in transmission connection with the active slip structure; and the first bevel gear is used for connecting a steering column.

Preferably, the active sliding structure comprises a sliding plate, a plurality of transmission teeth are respectively arranged on two surfaces of the sliding plate, and the active sliding structure is in transmission connection with the second bevel gear and the rack through the plurality of transmission teeth.

Preferably, the plurality of rollers are sequentially arranged in parallel along the length direction of the rack, and each roller is rotatably connected to the rack;

the driven sliding structure comprises a fixing plate, the fixing plate is parallel to the rack, a guide groove is formed in the surface, facing the rack, of the fixing plate, and the plurality of rolling shafts can roll in the guide groove.

Preferably, the driven sliding structure comprises a fixed plate, and the fixed plate is parallel to the rack;

the plurality of rollers are sequentially arranged in parallel along the length direction of the rack, and each roller is rotatably connected to the surface, facing the rack, of the fixing plate.

Preferably, the inner wall of the shell is provided with a locking groove, and the driven sliding structure is fixedly connected to the shell through the matching of a rolling locking pin and the locking groove.

Preferably, the gear-type electric power steering mechanism further includes a rack stabilizing device, and the rack stabilizing device is annular and is sleeved at the one end of the rack.

Preferably, the gear-type electric power steering mechanism further includes a pair of rack stabilizer fixing structures connected to the housing and respectively disposed at both sides of the rack stabilizer to limit axial displacement of the rack stabilizer.

Preferably, the gear-type electric power steering mechanism further includes a sound-absorbing damper, the sound-absorbing damper is sleeved on the rack and located on an axial inner side of the rack stabilizing device fixing structure.

Preferably, the gear type electric power steering mechanism further comprises a vibration isolation damper, and the vibration isolation damper is sleeved on the rack and located between the rack stabilizing device fixing structure and the sound absorption damper.

The beneficial effects of the utility model reside in that:

1. simple structure utilizes rolling contact can effectively reduce the energy loss because of rack friction brings among the steering process.

2. The problems of noise, vibration and steering fluctuation in the steering process can be solved.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.

Fig. 1 is a schematic structural view of a gear-type electric power steering mechanism according to an embodiment of the present invention.

Description of reference numerals:

1. a steering column; 2. a steering motor; 3. a steering gear set; 4. an active sliding structure; 5. a roller; 6. a rack; 7. a driven sliding structure; 8. a rolling locking pin; 9. sound absorption and damping; 10. shock insulation damping; 11. a rack stabilizing device; 12. a rack stabilizing device fixing structure; 13. a housing; 14. A tie rod.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

An embodiment of the utility model provides a gear formula electric power steering mechanism, include: the steering mechanism comprises a steering motor, a shell 13, a steering gear set, a driving sliding structure, a rack, a driven sliding structure and a plurality of rollers, wherein the steering gear set, the driving sliding structure, the rack, the driven sliding structure and the plurality of rollers are arranged in the shell 13;

wherein, steering motor, steering gear group, initiative glide configuration, rack are the transmission in proper order and are connected, and driven glide configuration fixed connection is in casing 13, and supports the rack through a plurality of rollers, and the one end of rack is used for connecting the tie rod.

When the steering wheel is steered, the steering column is driven to rotate after the steering wheel obtains steering angle input, the vehicle-mounted signal sensor provides a steering power-assisted signal, the control unit provides a motor control signal according to the steering power-assisted signal, the steering motor starts to work under the control of the motor control signal and outputs power, the power is transmitted to the rack through the steering gear set and the active sliding structure, and the rack drives the steering tie rod to move so as to drive the wheels to steer. In the process, the driven sliding structure supports the rack through a plurality of rollers, and the friction force of rolling contact is smaller than that of sliding contact, so that the energy loss caused by friction in the steering process is reduced.

Fig. 1 is a schematic structural view of a gear-type electric power steering mechanism according to an embodiment of the present invention. As shown in fig. 1, a gear-type electric power steering mechanism according to an embodiment of the present invention includes: the steering mechanism comprises a steering motor 2, a shell 13, a steering gear set 3, a driving sliding structure 4, a rack 6, a driven sliding structure 7 and a plurality of rollers 5, wherein the steering gear set 3, the driving sliding structure 4, the rack 6, the driven sliding structure 7 and the rollers 5 are arranged in the shell 13;

wherein, steering motor 2, steering gear group 3, initiative sliding structure 4, rack 6 are the transmission connection in proper order, and driven sliding structure 7 fixed connection is in casing 13, and supports rack 6 through a plurality of roller bearings 5, and the one end of rack 6 is used for connecting tie rod 14.

The steering gear set 3 comprises a first bevel gear and a second bevel gear which are meshed with each other, the first bevel gear is connected with an output shaft of the steering motor 2, and the second bevel gear is in transmission connection with the active sliding structure 4. The first bevel gear transmits the power of the steering motor 2 to the second bevel gear. The first bevel gear is also connected with the steering column 1 and is driven by the steering column 1 to rotate.

Initiative sliding structure 4 is equipped with a plurality of driving teeth respectively including the slide plate on two surfaces of slide plate, and initiative sliding structure 4 is connected with second bevel gear and the transmission of rack 6 respectively through a plurality of driving teeth to second bevel gear is through initiative sliding structure 4 with power transmission to rack 6.

In the present embodiment, a plurality of rollers 5 are sequentially arranged in parallel along the length direction of the rack 6, and each roller 5 is rotatably connected to the rack 6;

the driven sliding structure 7 comprises a fixed plate, the fixed plate is parallel to the rack 6, a guide groove is formed in the surface, facing the rack 6, of the fixed plate, and the plurality of rolling shafts 5 can roll in the guide groove.

When the rack 6 moves under the driving of the steering motor 2, the plurality of rollers 5 can roll in the guide grooves of the fixed plate so as to form rolling contact with the driven sliding structure 7, so that the friction force in the moving process of the rack is reduced, and the energy consumption is reduced.

Alternatively, in other embodiments, the driven sliding structure 7 comprises a fixed plate, parallel to the rack 6;

a plurality of rollers 5 are sequentially arranged in parallel along the length of the rack 6, and each roller 5 is rotatably coupled to a surface of the fixed plate facing the rack 6.

When the rack bar 6 is moved by the driving of the steering motor 2, the plurality of rollers 5 roll to support the rack bar 6 so as to form rolling contact with the rack bar 6, reducing frictional force during movement of the rack bar, thereby reducing power consumption.

In this embodiment, the inner wall of the housing 13 is provided with a locking groove, and the driven sliding structure 7 is fixedly connected to the housing 13 through the cooperation of the rolling locking pin 8 and the locking groove.

Optionally, the gear-type electric power steering mechanism further includes a rack stabilizing device 11, and the rack stabilizing device 11 is annular and is sleeved at one end of the rack 6, so that the rack 6 is stable in the moving process.

Alternatively, the gear type electric power steering mechanism further includes a pair of rack stabilizer fixing structures 12, and the pair of rack stabilizer fixing structures 12 are connected to the housing 13 and respectively disposed at both sides of the rack stabilizer 11 to limit axial displacement of the rack stabilizer 11. The rack stabilizer fixing structure 12 may be a block-shaped protrusion or other similar structure.

Optionally, the gear-type electric power steering further includes a sound absorbing damper 9, and the sound absorbing damper 9 is sleeved on the rack 6 and located axially inside the rack stabilizer fixing structure 12 to absorb noise during steering. The sound absorbing damper 9 may be of conventional construction and may be made of rubber or the like.

Optionally, the gear-type electric power steering mechanism further comprises a vibration isolation damper 10, wherein the vibration isolation damper 10 is sleeved on the rack 6 and located between the rack stabilizing device fixing structure 12 and the sound absorption damper 9 to achieve a vibration isolation effect. The seismic isolation damper 10 may be of conventional construction and may be made of rubber or the like.

While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A gear type electric power steering mechanism characterized by comprising: the steering mechanism comprises a steering motor, a shell, a steering gear set, a driving sliding structure, a rack, a driven sliding structure and a plurality of rolling shafts, wherein the steering gear set, the driving sliding structure, the rack, the driven sliding structure and the rolling shafts are arranged in the shell;

2. The gear-type electric power steering mechanism according to claim 1, wherein the steering gear set comprises a first bevel gear and a second bevel gear which are meshed with each other, the first bevel gear is connected with an output shaft of the steering motor, and the second bevel gear is in transmission connection with the active slip structure; and the first bevel gear is used for connecting a steering column.

3. The gear-type electric power steering mechanism according to claim 2, wherein the active sliding structure includes a sliding plate, two surfaces of the sliding plate are respectively provided with a plurality of transmission teeth, and the active sliding structure is respectively in transmission connection with the second bevel gear and the rack through the plurality of transmission teeth.

4. The gear-type electric power steering mechanism according to claim 1, wherein the plurality of rollers are arranged in parallel in sequence along a length direction of the rack bar, each of the rollers being rotatably coupled to the rack bar;

5. The gear-type electric power steering mechanism according to claim 1, wherein the driven slip structure includes a fixed plate, the fixed plate being parallel to the rack;

6. The gear-type electric power steering mechanism according to claim 1, wherein the housing has a detent recess formed in an inner wall thereof, and the driven sliding structure is fixedly coupled to the housing by engagement of a rolling detent pin with the detent recess.

7. The gear-type electric power steering mechanism according to claim 1, further comprising a rack stabilizer, wherein the rack stabilizer is annular and is fitted over the one end of the rack.

8. The gear-type electric power steering mechanism according to claim 7, further comprising a pair of rack stabilizer fixing structures connected to the housing and respectively provided on both sides of the rack stabilizer to restrict axial displacement of the rack stabilizer.

9. The geared electric power steering mechanism according to claim 8, further comprising a sound absorbing damper that is fitted over the rack and located axially inward of the rack stabilizer fixing structure.

10. The gear-type electric power steering mechanism according to claim 9, further comprising a vibration isolation damper, wherein the vibration isolation damper is sleeved on the rack and is located between the rack stabilizer fixing structure and the sound absorption damper.